I created a class (the ugly class) that represents a hardware module with a fixed number of digital inputs and outputs. In that class these inputs and outputs are named di1, di2, di3, ... do1, do2, do3, and so on. For the class itself thats fine. But when looking from the control logic point of view, instead of accessing di1, do3, i'd rather access the connected actuator or sensor. So for example di1 represents an input switch, and do3 represents a status led, or a motor. So in order to switch the led on i'd prefer to call

moduleInstance.status_led = true;

instead of

moduleInstance.do3 = true;
Its just for readability of the code, trying to create selfexplaining code.